Resp Flashcards
how common is lung cancer
3rd in the UK
types of NSCLC (80%) - other 20% is SCLC
- Adenocarcinoma (40%) (peripheral)
- SCC (20%) (central)
- Large-cell carcinoma (10%)
- Other types (10%)
what do SCLC contain
neurosecretory granules that release neuroendocrine hormones. SCLC may be responsible for various paraneoplastic syndrome
what is mesothelioma
- related to asbestos
- latent period of up to 45 years
- poor prognosis: palliative
presentation of lung cancer
- SOB
- haemoptysis
- clubbing
- cough
- recurrent pneumonia
- FLAWS
- supraclavicular LN
extrapulmonary manifestations of lung cancer
- Recurrent laryngeal nerve palsy presents with a hoarse voice = tumout pressing on RLN
- phrenic nerve palsy = due to nerve compression, causes diaphragm weakness and SOB
- SVCO = facial swelling, SOB, Pemberton’s sign
- Horner’s = ptosis, miosis, anhidrosis. Pancoast tumour
- SIADH= ectopic ADH by SCLC, hyponatraemia
- Cushing’s = ectopic ACTH by SCLC
- hypercalcaemia= ectopic PTH by SCC
- limbic encephalitis= paraneoplastic syndrome
- lambert eaton
2ww lung cancer referral criteria
- clubbing
- supraclavicular LN
- recurrent chest infection
- thrombocytosis
- chest signs
CXR cancer signs
- hilar enlargement
- peripheral opacity
- pleural effusion (unilateral)
- collapse
Ix for lung cancer
- staging CT
- PET
- bronchoscopy with EBUS
- histological
Mx of lung cancer
NSCLC
- surgery, radiotherapy, chemo
SCLC
- chemo and radiotherapy
endobronchial treatment with stents for palliative
main thoracotomy incisions
- anterolateral thoracotomy= incision around the front and side
- Axillary thoracotomy = incision in the axilla
- Posterolateral thoracotomy= incision back and side (most common)
Signs of URTI and LRTI
URTI- stridor
LRTI- wheeze
characteristic chest signs of pneumonia
- Bronchial breath sounds (harsh inspiratory and expiratory breath sounds) due to consolidation around the airways
- Focal coarse crackles caused by air passing through sputum in the airways
- Dullness to percussion due to lung tissue filled with sputum or collapsed
curb-65
Confusion
urea >7
RR >30
BP < 90/60
>65
0-1 mx at home
2: consider hospital
3: ITU
causes of pneumonia
- Streptococcus pneumoniae (most common)
- Haemophilus influenzae
- pseudomonas (CF/bronchiectasis)
- staph Aureus (CF)
- MRSA in HAP
atypical pneumonia
- legionella: air conditioning
- mycoplasma: erythema multiforme
- Coxiella burnetii: bodily fluids/animals
- chlamydia psittaci: infected birds
signs of klebsiella pneumonia
- alcoholic and diabetic
- currant jelly sputum
- affects upper lobes bilaterally
PCP features
- fungal pneumonia
- in HIV and low CD4
- dry cough, night sweats
- prohylactic co-trimoxazole if low CD4
Abx for mild CAP
5 days amox, doxy or clari
Abx for moderate/severe pneumonia
IV abx
amoxicillin and a macrolide
7-10 days
ABG for types of respiratory failure
- Type 1: normal PaCO2 and low PaO2 (1 wrong)
- Type 2: Raised PaCO2 and low PaO2 (2 wrong)
ABG raised bicarbonate
- chronic CO2 retainer.
- Kidneys produced bicarbonate to balance acidosis takes time.
- COPD patients
cause of resp alkalosis
hyperventilating
cause of metabolic acidosis
- raised lactate
- raised ketones
- increase hydrogen ions (renal failure)
- reduce bicarbonate (diarrhoea)
causes of metabolic alkalosis
- vomiting
- kidney increased activity of aldosterone increase H+ excretion (conn’s, cirrhosis, HF, diuretics)
what is ARDS
due to severe inflammatory reaction in lungs often secondary to sepsis or trauma
pathophysiology of ARDS
- Collapse of the alveoli and lung tissue (atelectasis)
- Pulmonary oedema (not related to heart failure or fluid overload)
- Decreased lung compliance (reduced lung inflation when ventilated with a given pressure)
- Fibrosis (typically after 10 days or more)
clinical signs of ARDS
- Acute respiratory distress
- Hypoxia with an inadequate response to oxygen therapy
- Bilateral infiltrates on a chest x-ray
Mx of ARDS
- resp support
- prone positioning
- fluid mx
what is end expiratory pressure
pressure that remains in airway at end of exhalation
what is PEEP
additional pressure at end of exhalation to keep lungs inflated
presents atelectasis
how is PEEP created
- head bobbing in children
- high flow NC
- NIV
- mechanical ventilation
what does high flow O2 do to dead space
deadspace washout
what is CPAP
constant pressure to maintain airway adding PEEP to those who likely to collapse e.g. OSA
what is NIV
- cycle of high and low pressure to correspond to the patient’s inspiration and expiration
obstructive lung disease
- FEV1 < 70% FVC so ratio of FEV1:FVC <70%
- obstruction blocking air from getting out quickly
- asthma: due to bronchoconstriction
- COPD due to airway and lung damage
restrictive lung disease
- FEV1 and FVC are equally reduced
- FEV1:FVC ratio greater than 70%
- FVC reduced to restriction of lung expansion + capacity
restrictive lung diseases
- Interstitial lung disease, such as idiopathic pulmonary fibrosis
- Sarcoidosis
- Obesity
- Motor neurone disease
- Scoliosis
atopic conditions
- asthma
- hayfever
- eczema
- food allergies
asthma examination findings
polyphonic expiratory wheeze
differentials for localised monophonic wheeze
- foreign body
- tumour
- mucus plug
medications that can worsen asthma
- BB
- NSAIDs
Ix for asthma
- spirometry
- reversibility with bronchodilator
- FeNO (marker of airway inflammation)
- peak flow
- direct bronchial challenge testing
moderate exacerbation of asthma
PEF 50-75%
severe exacerbation of asthma
- Peak flow 33-50%
- Respiratory rate above 25
- Heart rate above 110
- Unable to complete sentences
life threatening asthma
- Peak flow less than 33%
- O2 < 92%
- PaO2 less than 8 kPa
- Becoming tired
- Confusion or agitation
- No wheeze or silent chest
- Haemodynamic instability
mx of acute asthma
Moderate
- bronchodilator via spacer up to 10 puffs
Severe
+ prednisolone 40mg
salbutamol 5mg nebuliser
O2 to maintain 94-98%
Life threatening
- nebulised bronchodilator with ipratropium bromide
- prednisolone 40-50mg
- ABG every hour
- can give IV mag sulphate
- IV aminophylline by senior
long term management of asthma
- low dose ICS/formoterol (AIR therapy)
- low dose MART
- moderate dose MART
- check FeNO level
- trial either LTRA or LAMA in addition to moderate dose MART for 8-12 weeks
side effect of salbutamol
- hypokalaemia
- tachycardia
- lactic acidosis
mx post asthma exacerbation
- optimise long term mx
- asthma self management plan
- prednisolon 40-50mg for 5 days
- GP follow up within 2 days
what is COPD
long-term, progressive condition involving airway obstruction, chronic bronchitis and emphysema
most common organism causing infective exacerbations of COPD
haemophilus influenzae
then:
Streptococcus pneumoniae
Moraxella catarrhalis
what is chronic bronchitis
long-term symptoms of a cough and sputum production due to inflammation in the bronchi.
what is acute bronchitis
chest infection which is usually self-limiting in nature
inflammation of trachea and manjor bronchi
mx of acute bronchitis
analgesia
good fluid intake
consider doxycycline if patient has co-morbities or very unwell
what is emphysema
damage and dilatation of the alveolar sacs and alveoli, decreasing the surface area for gas exchange
presentation of COPD
- Shortness of breath
- Cough
- Sputum production
- Wheeze
- Recurrent respiratory infections, particularly in winter
- NO CLUBBING, HAEMOPTYSIS OR CHEST PAIN
MRC dyspnoea scale
- Grade 1: Breathless on strenuous exercise
- Grade 2: Breathless on walking uphill
- Grade 3: Breathlessness that slows walking on the flat
- Grade 4: Breathlessness stops them from walking > 100m on the flat
- Grade 5: Can’t leave the house due to breathlessness
severity of COPD
- Stage 1 (mild): FEV1 > 80% of predicted
- Stage 2 (moderate): FEV1 50-79% of predicted
- Stage 3 (severe): FEV1 30-49% of predicted
- Stage 4 (very severe): FEV1 less than 30% of predicted
long term mx of COPD
- stop smoking
- pneumococcal and flu vax
- pulmonary rehabiliation
mx of COPD
- SABA and ipratropium bromide
- steroids
- abx
no asthmatic/steroid responsive features
- LABA +LAMA
asthmatic/steroid responsive features
- LABA + ICS
final
- LABA, LAMA, ICS combo (trimbow)